-Fixed bug #30074 (apparent symbol table error with extract($blah, EXTR_REFS))

# appoligies, I did this in reverse (applied to PHP_5_2) I should have MFH.

ext/standard/array.c

@@ -1492,7 +1492,7 @@ PHP_FUNCTION(extract)
 
 					*orig_var = *entry;
 				} else {
-					if (var_array->refcount > 1) {
+					if (var_array->refcount > 1 || *entry == EG(uninitialized_zval_ptr)) {
 						SEPARATE_ZVAL_TO_MAKE_IS_REF(entry);
 					} else {
 						(*entry)->is_ref = 1;

ext/standard/tests/array/bug30074.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #30074 (EG(uninitialized_zval_ptr) gets set to reference using EXTR_REFS, affecting later values)
+--FILE--
+<?php
+error_reporting(E_ALL & ~E_NOTICE);   // We don't want the notice for $undefined
+$result = extract(array('a'=>$undefined), EXTR_REFS); 
+var_dump(array($a));
+echo "Done\n";
+?>
+--EXPECT--
+array(1) {
+  [0]=>
+  NULL
+}
+Done